20 files changed, 145 insertions, 154 deletions

diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c
index 8c9d50db5c3..c5855779058 100644
--- a/drivers/char/agp/intel-agp.c
+++ b/drivers/char/agp/intel-agp.c
@@ -49,6 +49,7 @@
 #define PCI_DEVICE_ID_INTEL_IGDNG_D_HB	    0x0040
 #define PCI_DEVICE_ID_INTEL_IGDNG_D_IG	    0x0042
 #define PCI_DEVICE_ID_INTEL_IGDNG_M_HB	    0x0044
+#define PCI_DEVICE_ID_INTEL_IGDNG_MA_HB	    0x0062
 #define PCI_DEVICE_ID_INTEL_IGDNG_M_IG	    0x0046
 
 /* cover 915 and 945 variants */
@@ -81,7 +82,8 @@
 		agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_GM45_HB || \
 		agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_G41_HB || \
 		agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_IGDNG_D_HB || \
-		agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_IGDNG_M_HB)
+		agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_IGDNG_M_HB || \
+		agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_IGDNG_MA_HB)
 
 extern int agp_memory_reserved;
 
@@ -1216,6 +1218,7 @@ static void intel_i965_get_gtt_range(int *gtt_offset, int *gtt_size)
 	case PCI_DEVICE_ID_INTEL_G41_HB:
 	case PCI_DEVICE_ID_INTEL_IGDNG_D_HB:
 	case PCI_DEVICE_ID_INTEL_IGDNG_M_HB:
+	case PCI_DEVICE_ID_INTEL_IGDNG_MA_HB:
 		*gtt_offset = *gtt_size = MB(2);
 		break;
 	default:
@@ -2195,6 +2198,8 @@ static const struct intel_driver_description {
 	    "IGDNG/D", NULL, &intel_i965_driver },
 	{ PCI_DEVICE_ID_INTEL_IGDNG_M_HB, PCI_DEVICE_ID_INTEL_IGDNG_M_IG, 0,
 	    "IGDNG/M", NULL, &intel_i965_driver },
+	{ PCI_DEVICE_ID_INTEL_IGDNG_MA_HB, PCI_DEVICE_ID_INTEL_IGDNG_M_IG, 0,
+	    "IGDNG/MA", NULL, &intel_i965_driver },
 	{ 0, 0, 0, NULL, NULL, NULL }
 };
 
@@ -2398,6 +2403,7 @@ static struct pci_device_id agp_intel_pci_table[] = {
 	ID(PCI_DEVICE_ID_INTEL_G41_HB),
 	ID(PCI_DEVICE_ID_INTEL_IGDNG_D_HB),
 	ID(PCI_DEVICE_ID_INTEL_IGDNG_M_HB),
+	ID(PCI_DEVICE_ID_INTEL_IGDNG_MA_HB),
 	{ }
 };
 
diff --git a/drivers/char/agp/parisc-agp.c b/drivers/char/agp/parisc-agp.c
index f4bb43fb801..e077701ae3d 100644
--- a/drivers/char/agp/parisc-agp.c
+++ b/drivers/char/agp/parisc-agp.c
@@ -225,7 +225,7 @@ static const struct agp_bridge_driver parisc_agp_driver = {
 	.configure		= parisc_agp_configure,
 	.fetch_size		= parisc_agp_fetch_size,
 	.tlb_flush		= parisc_agp_tlbflush,
-	.mask_memory		= parisc_agp_mask_memory,
+	.mask_memory		= parisc_agp_page_mask_memory,
 	.masks			= parisc_agp_masks,
 	.agp_enable		= parisc_agp_enable,
 	.cache_flush		= global_cache_flush,
diff --git a/drivers/char/hvc_iucv.c b/drivers/char/hvc_iucv.c
index 86105efb4eb..0ecac7e532f 100644
--- a/drivers/char/hvc_iucv.c
+++ b/drivers/char/hvc_iucv.c
@@ -1006,7 +1006,7 @@ static int __init hvc_iucv_alloc(int id, unsigned int is_console)
 	priv->dev->release = (void (*)(struct device *)) kfree;
 	rc = device_register(priv->dev);
 	if (rc) {
-		kfree(priv->dev);
+		put_device(priv->dev);
 		goto out_error_dev;
 	}
 
diff --git a/drivers/char/hw_random/amd-rng.c b/drivers/char/hw_random/amd-rng.c
index cd0ba51f7c8..0d8c5788b8e 100644
--- a/drivers/char/hw_random/amd-rng.c
+++ b/drivers/char/hw_random/amd-rng.c
@@ -44,8 +44,8 @@
  * want to register another driver on the same PCI id.
  */
 static const struct pci_device_id pci_tbl[] = {
-	{ 0x1022, 0x7443, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, },
-	{ 0x1022, 0x746b, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, },
+	{ PCI_VDEVICE(AMD, 0x7443), 0, },
+	{ PCI_VDEVICE(AMD, 0x746b), 0, },
 	{ 0, },	/* terminate list */
 };
 MODULE_DEVICE_TABLE(pci, pci_tbl);
diff --git a/drivers/char/hw_random/geode-rng.c b/drivers/char/hw_random/geode-rng.c
index 64d513f6836..4c4d4e140f9 100644
--- a/drivers/char/hw_random/geode-rng.c
+++ b/drivers/char/hw_random/geode-rng.c
@@ -46,8 +46,7 @@
  * want to register another driver on the same PCI id.
  */
 static const struct pci_device_id pci_tbl[] = {
-	{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LX_AES,
-	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, },
+	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), 0, },
 	{ 0, },	/* terminate list */
 };
 MODULE_DEVICE_TABLE(pci, pci_tbl);
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index afa8813e737..645237bda68 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -822,6 +822,7 @@ static const struct file_operations zero_fops = {
  * - permits private mappings, "copies" are taken of the source of zeros
  */
 static struct backing_dev_info zero_bdi = {
+	.name		= "char/mem",
 	.capabilities	= BDI_CAP_MAP_COPY,
 };
 
diff --git a/drivers/char/n_tty.c b/drivers/char/n_tty.c
index ff47907ff1b..4e28b35024e 100644
--- a/drivers/char/n_tty.c
+++ b/drivers/char/n_tty.c
@@ -300,8 +300,7 @@ static int do_output_char(unsigned char c, struct tty_struct *tty, int space)
 			if (space < 2)
 				return -1;
 			tty->canon_column = tty->column = 0;
-			tty_put_char(tty, '\r');
-			tty_put_char(tty, c);
+			tty->ops->write(tty, "\r\n", 2);
 			return 2;
 		}
 		tty->canon_column = tty->column;
@@ -1583,6 +1582,7 @@ static int n_tty_open(struct tty_struct *tty)
 
 static inline int input_available_p(struct tty_struct *tty, int amt)
 {
+	tty_flush_to_ldisc(tty);
 	if (tty->icanon) {
 		if (tty->canon_data)
 			return 1;
diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c
index 77b36488922..caf6e4d1946 100644
--- a/drivers/char/pcmcia/synclink_cs.c
+++ b/drivers/char/pcmcia/synclink_cs.c
@@ -4005,10 +4005,9 @@ static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
  *
  * skb  socket buffer containing HDLC frame
  * dev  pointer to network device structure
- *
- * returns 0 if success, otherwise error code
  */
-static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
+static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
+				      struct net_device *dev)
 {
 	MGSLPC_INFO *info = dev_to_port(dev);
 	unsigned long flags;
@@ -4043,7 +4042,7 @@ static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
 	}
 	spin_unlock_irqrestore(&info->lock,flags);
 
-	return 0;
+	return NETDEV_TX_OK;
 }
 
 /**
diff --git a/drivers/char/pty.c b/drivers/char/pty.c
index 6e6942c45f5..b33d6688e91 100644
--- a/drivers/char/pty.c
+++ b/drivers/char/pty.c
@@ -109,21 +109,13 @@ static int pty_space(struct tty_struct *to)
  *	the other side of the pty/tty pair.
  */
 
-static int pty_write(struct tty_struct *tty, const unsigned char *buf,
-								int count)
+static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c)
 {
 	struct tty_struct *to = tty->link;
-	int c;
 
 	if (tty->stopped)
 		return 0;
 
-	/* This isn't locked but our 8K is quite sloppy so no
-	   big deal */
-
-	c = pty_space(to);
-	if (c > count)
-		c = count;
 	if (c > 0) {
 		/* Stuff the data into the input queue of the other end */
 		c = tty_insert_flip_string(to, buf, c);
@@ -144,6 +136,8 @@ static int pty_write(struct tty_struct *tty, const unsigned char *buf,
 
 static int pty_write_room(struct tty_struct *tty)
 {
+	if (tty->stopped)
+		return 0;
 	return pty_space(tty->link);
 }
 
diff --git a/drivers/char/random.c b/drivers/char/random.c
index 8c7444857a4..d8a9255e1a3 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -240,6 +240,7 @@
 #include <linux/spinlock.h>
 #include <linux/percpu.h>
 #include <linux/cryptohash.h>
+#include <linux/fips.h>
 
 #ifdef CONFIG_GENERIC_HARDIRQS
 # include <linux/irq.h>
@@ -413,6 +414,7 @@ struct entropy_store {
 	unsigned add_ptr;
 	int entropy_count;
 	int input_rotate;
+	__u8 *last_data;
 };
 
 static __u32 input_pool_data[INPUT_POOL_WORDS];
@@ -852,12 +854,21 @@ static ssize_t extract_entropy(struct entropy_store *r, void *buf,
 {
 	ssize_t ret = 0, i;
 	__u8 tmp[EXTRACT_SIZE];
+	unsigned long flags;
 
 	xfer_secondary_pool(r, nbytes);
 	nbytes = account(r, nbytes, min, reserved);
 
 	while (nbytes) {
 		extract_buf(r, tmp);
+
+		if (r->last_data) {
+			spin_lock_irqsave(&r->lock, flags);
+			if (!memcmp(tmp, r->last_data, EXTRACT_SIZE))
+				panic("Hardware RNG duplicated output!\n");
+			memcpy(r->last_data, tmp, EXTRACT_SIZE);
+			spin_unlock_irqrestore(&r->lock, flags);
+		}
 		i = min_t(int, nbytes, EXTRACT_SIZE);
 		memcpy(buf, tmp, i);
 		nbytes -= i;
@@ -940,6 +951,9 @@ static void init_std_data(struct entropy_store *r)
 	now = ktime_get_real();
 	mix_pool_bytes(r, &now, sizeof(now));
 	mix_pool_bytes(r, utsname(), sizeof(*(utsname())));
+	/* Enable continuous test in fips mode */
+	if (fips_enabled)
+		r->last_data = kmalloc(EXTRACT_SIZE, GFP_KERNEL);
 }
 
 static int rand_initialize(void)
diff --git a/drivers/char/raw.c b/drivers/char/raw.c
index 05f9d18b936..40268db02e2 100644
--- a/drivers/char/raw.c
+++ b/drivers/char/raw.c
@@ -246,7 +246,7 @@ static const struct file_operations raw_fops = {
 	.read	=	do_sync_read,
 	.aio_read = 	generic_file_aio_read,
 	.write	=	do_sync_write,
-	.aio_write = 	generic_file_aio_write_nolock,
+	.aio_write =	blkdev_aio_write,
 	.open	=	raw_open,
 	.release=	raw_release,
 	.ioctl	=	raw_ioctl,
diff --git a/drivers/char/serial167.c b/drivers/char/serial167.c
index 51e7a46787b..5942a9d674c 100644
--- a/drivers/char/serial167.c
+++ b/drivers/char/serial167.c
@@ -171,7 +171,6 @@ static int startup(struct cyclades_port *);
 static void cy_throttle(struct tty_struct *);
 static void cy_unthrottle(struct tty_struct *);
 static void config_setup(struct cyclades_port *);
-extern void console_print(const char *);
 #ifdef CYCLOM_SHOW_STATUS
 static void show_status(int);
 #endif
@@ -245,7 +244,7 @@ void SP(char *data)
 {
 	unsigned long flags;
 	local_irq_save(flags);
-	console_print(data);
+	printk(KERN_EMERG "%s", data);
 	local_irq_restore(flags);
 }
 
@@ -255,7 +254,7 @@ void CP(char data)
 	unsigned long flags;
 	local_irq_save(flags);
 	scrn[0] = data;
-	console_print(scrn);
+	printk(KERN_EMERG "%c", scrn);
 	local_irq_restore(flags);
 }				/* CP */
 
diff --git a/drivers/char/synclink.c b/drivers/char/synclink.c
index 813552f1488..4846b73ef28 100644
--- a/drivers/char/synclink.c
+++ b/drivers/char/synclink.c
@@ -7697,10 +7697,9 @@ static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
  *
  * skb  socket buffer containing HDLC frame
  * dev  pointer to network device structure
- *
- * returns 0 if success, otherwise error code
  */
-static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
+static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
+				      struct net_device *dev)
 {
 	struct mgsl_struct *info = dev_to_port(dev);
 	unsigned long flags;
@@ -7731,7 +7730,7 @@ static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
 	 	usc_start_transmitter(info);
 	spin_unlock_irqrestore(&info->irq_spinlock,flags);
 
-	return 0;
+	return NETDEV_TX_OK;
 }
 
 /**
diff --git a/drivers/char/synclink_gt.c b/drivers/char/synclink_gt.c
index 91f20a92fdd..8678f0c8699 100644
--- a/drivers/char/synclink_gt.c
+++ b/drivers/char/synclink_gt.c
@@ -1497,10 +1497,9 @@ static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
  *
  * skb  socket buffer containing HDLC frame
  * dev  pointer to network device structure
- *
- * returns 0 if success, otherwise error code
  */
-static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
+static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
+				      struct net_device *dev)
 {
 	struct slgt_info *info = dev_to_port(dev);
 	unsigned long flags;
@@ -1529,7 +1528,7 @@ static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
 	update_tx_timer(info);
 	spin_unlock_irqrestore(&info->lock,flags);
 
-	return 0;
+	return NETDEV_TX_OK;
 }
 
 /**
diff --git a/drivers/char/synclinkmp.c b/drivers/char/synclinkmp.c
index 8d4a2a8a0a7..2b18adc4ee1 100644
--- a/drivers/char/synclinkmp.c
+++ b/drivers/char/synclinkmp.c
@@ -1608,10 +1608,9 @@ static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
  *
  * skb  socket buffer containing HDLC frame
  * dev  pointer to network device structure
- *
- * returns 0 if success, otherwise error code
  */
-static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
+static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
+				      struct net_device *dev)
 {
 	SLMP_INFO *info = dev_to_port(dev);
 	unsigned long flags;
@@ -1642,7 +1641,7 @@ static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
 	 	tx_start(info);
 	spin_unlock_irqrestore(&info->lock,flags);
 
-	return 0;
+	return NETDEV_TX_OK;
 }
 
 /**
diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c
index 0db35857e4d..50eecfe1d72 100644
--- a/drivers/char/sysrq.c
+++ b/drivers/char/sysrq.c
@@ -24,6 +24,7 @@
 #include <linux/sysrq.h>
 #include <linux/kbd_kern.h>
 #include <linux/proc_fs.h>
+#include <linux/nmi.h>
 #include <linux/quotaops.h>
 #include <linux/perf_counter.h>
 #include <linux/kernel.h>
@@ -35,7 +36,6 @@
 #include <linux/spinlock.h>
 #include <linux/vt_kern.h>
 #include <linux/workqueue.h>
-#include <linux/kexec.h>
 #include <linux/hrtimer.h>
 #include <linux/oom.h>
 
@@ -124,9 +124,12 @@ static struct sysrq_key_op sysrq_unraw_op = {
 static void sysrq_handle_crash(int key, struct tty_struct *tty)
 {
 	char *killer = NULL;
+
+	panic_on_oops = 1;	/* force panic */
+	wmb();
 	*killer = 1;
 }
-static struct sysrq_key_op sysrq_crashdump_op = {
+static struct sysrq_key_op sysrq_crash_op = {
 	.handler	= sysrq_handle_crash,
 	.help_msg	= "Crash",
 	.action_msg	= "Trigger a crash",
@@ -220,12 +223,20 @@ static DECLARE_WORK(sysrq_showallcpus, sysrq_showregs_othercpus);
 
 static void sysrq_handle_showallcpus(int key, struct tty_struct *tty)
 {
-	struct pt_regs *regs = get_irq_regs();
-	if (regs) {
-		printk(KERN_INFO "CPU%d:\n", smp_processor_id());
-		show_regs(regs);
+	/*
+	 * Fall back to the workqueue based printing if the
+	 * backtrace printing did not succeed or the
+	 * architecture has no support for it:
+	 */
+	if (!trigger_all_cpu_backtrace()) {
+		struct pt_regs *regs = get_irq_regs();
+
+		if (regs) {
+			printk(KERN_INFO "CPU%d:\n", smp_processor_id());
+			show_regs(regs);
+		}
+		schedule_work(&sysrq_showallcpus);
 	}
-	schedule_work(&sysrq_showallcpus);
 }
 
 static struct sysrq_key_op sysrq_showallcpus_op = {
@@ -401,7 +412,7 @@ static struct sysrq_key_op *sysrq_key_table[36] = {
 	 */
 	NULL,				/* a */
 	&sysrq_reboot_op,		/* b */
-	&sysrq_crashdump_op,		/* c & ibm_emac driver debug */
+	&sysrq_crash_op,		/* c & ibm_emac driver debug */
 	&sysrq_showlocks_op,		/* d */
 	&sysrq_term_op,			/* e */
 	&sysrq_moom_op,			/* f */
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index aec1931608a..0b73e4ec1ad 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -450,6 +450,12 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
 		goto out_err;
 	}
 
+	/* Default timeouts */
+	chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
+	chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
+	chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
+	chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
+
 	if (request_locality(chip, 0) != 0) {
 		rc = -ENODEV;
 		goto out_err;
@@ -457,12 +463,6 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
 
 	vendor = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
 
-	/* Default timeouts */
-	chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
-	chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
-	chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
-	chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
-
 	dev_info(dev,
 		 "1.2 TPM (device-id 0x%X, rev-id %d)\n",
 		 vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
diff --git a/drivers/char/tty_buffer.c b/drivers/char/tty_buffer.c
index 810ee25d66a..3108991c5c8 100644
--- a/drivers/char/tty_buffer.c
+++ b/drivers/char/tty_buffer.c
@@ -462,6 +462,19 @@ static void flush_to_ldisc(struct work_struct *work)
 }
 
 /**
+ *	tty_flush_to_ldisc
+ *	@tty: tty to push
+ *
+ *	Push the terminal flip buffers to the line discipline.
+ *
+ *	Must not be called from IRQ context.
+ */
+void tty_flush_to_ldisc(struct tty_struct *tty)
+{
+	flush_to_ldisc(&tty->buf.work.work);
+}
+
+/**
  *	tty_flip_buffer_push	-	terminal
  *	@tty: tty to push
  *
diff --git a/drivers/char/tty_ldisc.c b/drivers/char/tty_ldisc.c
index acd76b767d4..e48af9f7921 100644
--- a/drivers/char/tty_ldisc.c
+++ b/drivers/char/tty_ldisc.c
@@ -48,6 +48,41 @@ static DECLARE_WAIT_QUEUE_HEAD(tty_ldisc_wait);
 /* Line disc dispatch table */
 static struct tty_ldisc_ops *tty_ldiscs[NR_LDISCS];
 
+static inline struct tty_ldisc *get_ldisc(struct tty_ldisc *ld)
+{
+	if (ld)
+		atomic_inc(&ld->users);
+	return ld;
+}
+
+static void put_ldisc(struct tty_ldisc *ld)
+{
+	unsigned long flags;
+
+	if (WARN_ON_ONCE(!ld))
+		return;
+
+	/*
+	 * If this is the last user, free the ldisc, and
+	 * release the ldisc ops.
+	 *
+	 * We really want an "atomic_dec_and_lock_irqsave()",
+	 * but we don't have it, so this does it by hand.
+	 */
+	local_irq_save(flags);
+	if (atomic_dec_and_lock(&ld->users, &tty_ldisc_lock)) {
+		struct tty_ldisc_ops *ldo = ld->ops;
+
+		ldo->refcount--;
+		module_put(ldo->owner);
+		spin_unlock_irqrestore(&tty_ldisc_lock, flags);
+
+		kfree(ld);
+		return;
+	}
+	local_irq_restore(flags);
+}
+
 /**
  *	tty_register_ldisc	-	install a line discipline
  *	@disc: ldisc number
@@ -142,7 +177,7 @@ static struct tty_ldisc *tty_ldisc_try_get(int disc)
 			/* lock it */
 			ldops->refcount++;
 			ld->ops = ldops;
-			ld->refcount = 0;
+			atomic_set(&ld->users, 1);
 			err = 0;
 		}
 	}
@@ -181,35 +216,6 @@ static struct tty_ldisc *tty_ldisc_get(int disc)
 	return ld;
 }
 
-/**
- *	tty_ldisc_put		-	drop ldisc reference
- *	@ld: ldisc
- *
- *	Drop a reference to a line discipline. Manage refcounts and
- *	module usage counts. Free the ldisc once the recount hits zero.
- *
- *	Locking:
- *		takes tty_ldisc_lock to guard against ldisc races
- */
-
-static void tty_ldisc_put(struct tty_ldisc *ld)
-{
-	unsigned long flags;
-	int disc = ld->ops->num;
-	struct tty_ldisc_ops *ldo;
-
-	BUG_ON(disc < N_TTY || disc >= NR_LDISCS);
-
-	spin_lock_irqsave(&tty_ldisc_lock, flags);
-	ldo = tty_ldiscs[disc];
-	BUG_ON(ldo->refcount == 0);
-	ldo->refcount--;
-	module_put(ldo->owner);
-	spin_unlock_irqrestore(&tty_ldisc_lock, flags);
-	WARN_ON(ld->refcount);
-	kfree(ld);
-}
-
 static void *tty_ldiscs_seq_start(struct seq_file *m, loff_t *pos)
 {
 	return (*pos < NR_LDISCS) ? pos : NULL;
@@ -234,7 +240,7 @@ static int tty_ldiscs_seq_show(struct seq_file *m, void *v)
 	if (IS_ERR(ld))
 		return 0;
 	seq_printf(m, "%-10s %2d\n", ld->ops->name ? ld->ops->name : "???", i);
-	tty_ldisc_put(ld);
+	put_ldisc(ld);
 	return 0;
 }
 
@@ -288,20 +294,17 @@ static void tty_ldisc_assign(struct tty_struct *tty, struct tty_ldisc *ld)
  *	Locking: takes tty_ldisc_lock
  */
 
-static int tty_ldisc_try(struct tty_struct *tty)
+static struct tty_ldisc *tty_ldisc_try(struct tty_struct *tty)
 {
 	unsigned long flags;
 	struct tty_ldisc *ld;
-	int ret = 0;
 
 	spin_lock_irqsave(&tty_ldisc_lock, flags);
-	ld = tty->ldisc;
-	if (test_bit(TTY_LDISC, &tty->flags)) {
-		ld->refcount++;
-		ret = 1;
-	}
+	ld = NULL;
+	if (test_bit(TTY_LDISC, &tty->flags))
+		ld = get_ldisc(tty->ldisc);
 	spin_unlock_irqrestore(&tty_ldisc_lock, flags);
-	return ret;
+	return ld;
 }
 
 /**
@@ -322,10 +325,11 @@ static int tty_ldisc_try(struct tty_struct *tty)
 
 struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *tty)
 {
+	struct tty_ldisc *ld;
+
 	/* wait_event is a macro */
-	wait_event(tty_ldisc_wait, tty_ldisc_try(tty));
-	WARN_ON(tty->ldisc->refcount == 0);
-	return tty->ldisc;
+	wait_event(tty_ldisc_wait, (ld = tty_ldisc_try(tty)) != NULL);
+	return ld;
 }
 EXPORT_SYMBOL_GPL(tty_ldisc_ref_wait);
 
@@ -342,9 +346,7 @@ EXPORT_SYMBOL_GPL(tty_ldisc_ref_wait);
 
 struct tty_ldisc *tty_ldisc_ref(struct tty_struct *tty)
 {
-	if (tty_ldisc_try(tty))
-		return tty->ldisc;
-	return NULL;
+	return tty_ldisc_try(tty);
 }
 EXPORT_SYMBOL_GPL(tty_ldisc_ref);
 
@@ -360,21 +362,15 @@ EXPORT_SYMBOL_GPL(tty_ldisc_ref);
 
 void tty_ldisc_deref(struct tty_ldisc *ld)
 {
-	unsigned long flags;
-
-	BUG_ON(ld == NULL);
-
-	spin_lock_irqsave(&tty_ldisc_lock, flags);
-	if (ld->refcount == 0)
-		printk(KERN_ERR "tty_ldisc_deref: no references.\n");
-	else
-		ld->refcount--;
-	if (ld->refcount == 0)
-		wake_up(&tty_ldisc_wait);
-	spin_unlock_irqrestore(&tty_ldisc_lock, flags);
+	put_ldisc(ld);
 }
 EXPORT_SYMBOL_GPL(tty_ldisc_deref);
 
+static inline void tty_ldisc_put(struct tty_ldisc *ld)
+{
+	put_ldisc(ld);
+}
+
 /**
  *	tty_ldisc_enable	-	allow ldisc use
  *	@tty: terminal to activate ldisc on
@@ -512,8 +508,9 @@ static void tty_ldisc_restore(struct tty_struct *tty, struct tty_ldisc *old)
  *	be obtained while the delayed work queue halt ensures that no more
  *	data is fed to the ldisc.
  *
- *	In order to wait for any existing references to complete see
- *	tty_ldisc_wait_idle.
+ *	You need to do a 'flush_scheduled_work()' (outside the ldisc_mutex)
+ *	in order to make sure any currently executing ldisc work is also
+ *	flushed.
  */
 
 static int tty_ldisc_halt(struct tty_struct *tty)
@@ -523,31 +520,6 @@ static int tty_ldisc_halt(struct tty_struct *tty)
 }
 
 /**
- *	tty_ldisc_wait_idle	-	wait for the ldisc to become idle
- *	@tty: tty to wait for
- *
- *	Wait for the line discipline to become idle. The discipline must
- *	have been halted for this to guarantee it remains idle.
- *
- *	tty_ldisc_lock protects the ref counts currently.
- */
-
-static int tty_ldisc_wait_idle(struct tty_struct *tty)
-{
-	unsigned long flags;
-	spin_lock_irqsave(&tty_ldisc_lock, flags);
-	while (tty->ldisc->refcount) {
-		spin_unlock_irqrestore(&tty_ldisc_lock, flags);
-		if (wait_event_timeout(tty_ldisc_wait,
-				tty->ldisc->refcount == 0, 5 * HZ) == 0)
-			return -EBUSY;
-		spin_lock_irqsave(&tty_ldisc_lock, flags);
-	}
-	spin_unlock_irqrestore(&tty_ldisc_lock, flags);
-	return 0;
-}
-
-/**
  *	tty_set_ldisc		-	set line discipline
  *	@tty: the terminal to set
  *	@ldisc: the line discipline
@@ -642,14 +614,6 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
 
 	flush_scheduled_work();
 
-	/* Let any existing reference holders finish */
-	retval = tty_ldisc_wait_idle(tty);
-	if (retval < 0) {
-		clear_bit(TTY_LDISC_CHANGING, &tty->flags);
-		tty_ldisc_put(new_ldisc);
-		return retval;
-	}
-
 	mutex_lock(&tty->ldisc_mutex);
 	if (test_bit(TTY_HUPPED, &tty->flags)) {
 		/* We were raced by the hangup method. It will have stomped
@@ -790,12 +754,14 @@ void tty_ldisc_hangup(struct tty_struct *tty)
 	 * N_TTY.
 	 */
 	if (tty->driver->flags & TTY_DRIVER_RESET_TERMIOS) {
+		/* Make sure the old ldisc is quiescent */
+		tty_ldisc_halt(tty);
+		flush_scheduled_work();
+
 		/* Avoid racing set_ldisc or tty_ldisc_release */
 		mutex_lock(&tty->ldisc_mutex);
 		if (tty->ldisc) {	/* Not yet closed */
 			/* Switch back to N_TTY */
-			tty_ldisc_halt(tty);
-			tty_ldisc_wait_idle(tty);
 			tty_ldisc_reinit(tty);
 			/* At this point we have a closed ldisc and we want to
 			   reopen it. We could defer this to the next open but
@@ -860,14 +826,6 @@ void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty)
 	tty_ldisc_halt(tty);
 	flush_scheduled_work();
 
-	/*
-	 * Wait for any short term users (we know they are just driver
-	 * side waiters as the file is closing so user count on the file
-	 * side is zero.
-	 */
-
-	tty_ldisc_wait_idle(tty);
-
 	mutex_lock(&tty->ldisc_mutex);
 	/*
 	 * Now kill off the ldisc
diff --git a/drivers/char/vr41xx_giu.c b/drivers/char/vr41xx_giu.c
deleted file mode 100644
index e69de29bb2d..00000000000
--- a/drivers/char/vr41xx_giu.c
+++ /dev/null